Specialized - Gauge Tube ·Gauge
Thermocouple vacuum gauge using filament heating and gas-dependent thermal transfer, intended for roughly 1 to 10^-2 mm Hg pressure measurement.
Westinghouse March 15,1961 THERMOCOUPLE VACUUM GAUGE TYPE 7677 The 7677 features a thermocouple heated by a filament, The internal gas pressure detennines the heat transfer characteristics and thereby the output of the thermocouple. The type 7677 is useful for pressure measureinents in the range from 1 to 10~2 millimeters of mercury. ELECTRICAL: OPERATIONAL: Thermocouple Materials . ... ......... Nichrome 8 Advance Heater Current. . . . .. oo v v o v v TR 25 Ma, Heater Resistance ¢t 25°C ... .. e e e 65 Chms Thermocouple Output: Thermocouple Resistance 0t 25°C ., ... ... ...... 10 O4me At 0= mm Hg Pressure, « v v v o v e e e e 0 mV¥. MECHANICAL: MOUNHIG POSTHION < o o v vt it vt v tn e s snnns Vertical Note: Other thermocouple gauge tubes, similar to type 7677 but Base. .« ..l it i i et et e JEDEC A4-9 having different sizes ond materiols of tubulation, ars Tubulation: available under different numbers, Diometar . . v i ittt i e s e e e e e, 3/8" Material . . . . ..ttt it e e, Nenex, C
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
No fixed ratings are recorded for this section.
Source-derived physical/electrical section.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Heater Resistance ¢t
65
Heater Resistance ¢t 25°C ... .. e e e 65 Chms Thermocouple Output:
Thermocouple Resistance
0
Thermocouple Resistance 0t 25°C ., ... ... ...... 10 O4me At 0= mm Hg Pressure, « v v v o v e e e e 0 mV¥.